Remember: you should always try to use Debian codenames (i.e. etch, lenny, squeeze) and not "stable" in your /etc/apt/sources.list file (see also the hint in the Debian release notes). Cause if you don't new Debian releases are nothing to look forward to...

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When booting the Debian installer via PXE (see the relevant chapter in the Installation Guide for how to setup DHCP/TFTP and where to download the necessary files), the next logical step is to use a local Debian mirror in your network.

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Using the entry in the proc-Filesystem of a running process, it's easy to get a sorted list of environment variables for a certain process ID (PID):

tr '\0' '\n' < /proc/<PID>/environ | sort

Since the lines in environ are null-terminated, putting proper newlines in the output with tr is necessary before sorting. (sort can only output lines terminated with \0 using the option -z, but not read them, besides: even -z doesn't quite work as expected in my case)